Blank for paper cups.



D. F. CURTIN.

BLANK FOR PAPER CUPS.

APPLICATION FILED SEPT-22.19l4- RENEWED NOV. 1!.1915.

Patented June 20, 1916.

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Specification of Letters Patent.

Application filed September 22, 1914, Serial No. 862,871. Renewed November 11, 1915. Serial Ito. 60,996.

To all whom it may concern:

Be it known that I, DAVID F. OURTIN, a citizen of the United States,'and a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Blanks for Paper Cups, of which the following is a specification.

My invention is an improvement in blanks view of the blank from which the cup is formed.-

The blank forming the subject-matter of the present invention is cut from aper, which may be treated with paraffin 1f desired or which may be plain in accordance with conditions, and the blank 1 is of approximately quadrantal form.

The blank as shown in Fig. 2, has a curved edge 2, and straight edges 3 and 4, and the blank is provided with a semi-circular extension 5, at the side 4. The extension 5 is integral with the body of the blank 1, but the said extension is artially separated from the bod of the b ank by means of a slit or cut 6. his slit or cut 6 extends from the side 4 but is not in alinement with the said side, that is, the slit is not a straight continuation of the said side. The slit 6 extends at an obtuse angle to the side 4, and the slit is of a length equal to one-half of the diameter of the extension. That is, the slit 6 extends from the center of the extension 5 to that edge of the said extension which would join the side 4 if the slit were not made.

The side 2 of the body 1 of the blank merges into the curved edge of the extension, being continuous therewith. The blank arranged as above described is formed into a conical cup, with the edges 4 and 3 lapping upon each other, and with that s de of the blank adjacent to the edge 3 outside of that portion adjacent to the edge 4. The

extension 5 is lapped around the apex of the vessel formed in this manner, and the free end of the said extension may be provlded with an adhesive if desired to cause the said free end to adhere to the outer surface of the blank 1 to hold the cup in formed posi- The blank 1 is somewhat greater than a quadrant, the center of the blank being at or near the center of the extension 5. This central point indicated at 7 is theapex of the vessel or cup when the blank is formed, and all of the extension 5 and a portion of the body of the blank 1 is wrapped around the apex as shown in Fig. 1 toreinforce and strengthen the vessel at this point.

It is obvious that that portion of the blank adjacent to the edge 3 might be provided with an adhesive if desired to make the said edge adhere closely to the face of that portion of the blank adjacent to the edge 4.

It will be noticed from an inspection of Fig. 1, that a suflicient portion of the blank ad acent to the edge 3 is lapped upon the edge 4 to provide a secure connection at the said edge. The holders with which the cups are intended to be used are of conical form, and of such size that the blank when in the cup will fit smoothly within the holder. Thus the holders serve also to strengthen and reinforce the cup.

The machine above referred to consists of two conical dies, around one of which the blank is folded to form the cup, the other acting as a counter-pressing device to assist in the formation.

I claim 1. A blank for forming conical vessels,

said blank being of approximately quadrantal form, and having a curved and two straight edges, said blank having a semicircular segmental extension at one of the straight edges and having its diameter approximately in line with the other straight edge, the first-named straight edge being continuous with the curved edge of the extension, said blank having a slit extending from the junction of the curved edge of the extension with the last-named straight edge to the center of the diameter of the extension, and the said center being at approximately the center of the circle upon whose arc the curved edge of the body of the blank is formed.

2. A blank for forming conical vessels, said blankbeing of approximately quadrantal form, and having a curved and two straight edges, said blank having a semilP'atented June 21), 191%.. w

10 blank being of approximately quadrantal form having a curved and two straight edges, and the said blank having an extension between the adjacent ends of the stralght edges, said extension being partially separated from the blank at one of the 1 straight edges. v DAVID F. CURTIN. Witnesses:

' IVA Hoovnn ANNA M. KLEIN. 

